REN-Redes Energeticas Nacionais

M&A Activity • Sep 29, 2025

Unofficial Translation This is an unofficial translation of the communication indicated below and it has been prepared for information purposes only. In the event of any discrepancy between this translation and the Portuguese version, the Portuguese version will prevail.

Acquisition of a portfolio of electricity transmission assets in Chile

Under the terms and for the purposes of Article 17 of Regulation (EU) No. 596/2014 of the European Parliament and of the Council of 16 April 2014 and other applicable regulations, REN – Redes Energéticas Nacionais, S.G.P.S., S.A. ("REN") hereby informs the market and the general public that its subsidiary Empresa de Transmisión Eléctrica Transemel S.A. ("Transemel") has, on this date, completed the acquisition of a portfolio of electricity transmission assets in Chile from MLP Transmisión S.A., a company controlled by Antofagasta Plc, for a total consideration of 67.5 million U.S. dollars. COMMUNICATION

The portfolio, located in the north-central region of Chile, comprises approximately 144 Kms of transmission lines. The assets were developed to support the mining operations of Minera los Pelambres, one of the world's largest copper mines, controlled by Antofagasta Plc, one of the world's leading copper producers. The facilities have been recently reclassified as regulated assets under the tariff review process for the 2024–2027 regulatory period.

With this acquisition, Transemel, REN's Chilean subsidiary active in the electricity transmission sector, will operate approximately 423 Kms of transmission lines and 5 substations. Investor Relations Office Phone: +351 21 001 3546 ir@ren.pt

The acquisition was carried out in accordance with REN's strict financial discipline, ensuring sustained profitability and the preservation of credit metrics compatible with maintaining an investment grade rating.

The transaction aligns with REN's strategic plan, which in regard to Chile, combines organic growth and selective acquisitions of operational assets of appropriate scale and a risk-return profile consistent with REN's prudent investment principles and technical expertise.

The acquisition will be fully financed through external debt.

REN – REDES ENERGÉTICAS NACIONAIS, SGPS, S.A Lisbon, September 29th, 2025